Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * Device probing and sysfs code. | |
19a15b93 KH |
3 | * |
4 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/delay.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
c9755e14 | 28 | #include <linux/string.h> |
6188e10d MW |
29 | #include <linux/rwsem.h> |
30 | #include <linux/semaphore.h> | |
b5d2a5e0 | 31 | #include <asm/system.h> |
7feb9cce | 32 | #include <linux/ctype.h> |
19a15b93 KH |
33 | #include "fw-transaction.h" |
34 | #include "fw-topology.h" | |
35 | #include "fw-device.h" | |
36 | ||
37 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
38 | { | |
39 | ci->p = p + 1; | |
40 | ci->end = ci->p + (p[0] >> 16); | |
41 | } | |
19a15b93 KH |
42 | EXPORT_SYMBOL(fw_csr_iterator_init); |
43 | ||
44 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
45 | { | |
46 | *key = *ci->p >> 24; | |
47 | *value = *ci->p & 0xffffff; | |
48 | ||
49 | return ci->p++ < ci->end; | |
50 | } | |
19a15b93 KH |
51 | EXPORT_SYMBOL(fw_csr_iterator_next); |
52 | ||
53 | static int is_fw_unit(struct device *dev); | |
54 | ||
21ebcd12 | 55 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
56 | { |
57 | struct fw_csr_iterator ci; | |
58 | int key, value, match; | |
59 | ||
60 | match = 0; | |
61 | fw_csr_iterator_init(&ci, directory); | |
62 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
63 | if (key == CSR_VENDOR && value == id->vendor) | |
64 | match |= FW_MATCH_VENDOR; | |
65 | if (key == CSR_MODEL && value == id->model) | |
66 | match |= FW_MATCH_MODEL; | |
67 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
68 | match |= FW_MATCH_SPECIFIER_ID; | |
69 | if (key == CSR_VERSION && value == id->version) | |
70 | match |= FW_MATCH_VERSION; | |
71 | } | |
72 | ||
73 | return (match & id->match_flags) == id->match_flags; | |
74 | } | |
75 | ||
76 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
77 | { | |
78 | struct fw_unit *unit = fw_unit(dev); | |
79 | struct fw_driver *driver = fw_driver(drv); | |
80 | int i; | |
81 | ||
82 | /* We only allow binding to fw_units. */ | |
83 | if (!is_fw_unit(dev)) | |
84 | return 0; | |
85 | ||
86 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
87 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
88 | return 1; | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
95 | { | |
96 | struct fw_device *device = fw_device(unit->device.parent); | |
97 | struct fw_csr_iterator ci; | |
98 | ||
99 | int key, value; | |
100 | int vendor = 0; | |
101 | int model = 0; | |
102 | int specifier_id = 0; | |
103 | int version = 0; | |
104 | ||
105 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
106 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
107 | switch (key) { | |
108 | case CSR_VENDOR: | |
109 | vendor = value; | |
110 | break; | |
111 | case CSR_MODEL: | |
112 | model = value; | |
113 | break; | |
114 | } | |
115 | } | |
116 | ||
117 | fw_csr_iterator_init(&ci, unit->directory); | |
118 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
119 | switch (key) { | |
120 | case CSR_SPECIFIER_ID: | |
121 | specifier_id = value; | |
122 | break; | |
123 | case CSR_VERSION: | |
124 | version = value; | |
125 | break; | |
126 | } | |
127 | } | |
128 | ||
129 | return snprintf(buffer, buffer_size, | |
130 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
131 | vendor, model, specifier_id, version); | |
132 | } | |
133 | ||
134 | static int | |
7eff2e7a | 135 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
136 | { |
137 | struct fw_unit *unit = fw_unit(dev); | |
138 | char modalias[64]; | |
19a15b93 | 139 | |
2d826cc5 | 140 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 141 | |
7eff2e7a | 142 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
143 | return -ENOMEM; |
144 | ||
19a15b93 KH |
145 | return 0; |
146 | } | |
147 | ||
148 | struct bus_type fw_bus_type = { | |
362c2c8c | 149 | .name = "firewire", |
19a15b93 | 150 | .match = fw_unit_match, |
19a15b93 | 151 | }; |
19a15b93 KH |
152 | EXPORT_SYMBOL(fw_bus_type); |
153 | ||
19a15b93 KH |
154 | static void fw_device_release(struct device *dev) |
155 | { | |
156 | struct fw_device *device = fw_device(dev); | |
855c603d | 157 | struct fw_card *card = device->card; |
19a15b93 KH |
158 | unsigned long flags; |
159 | ||
c781c06d KH |
160 | /* |
161 | * Take the card lock so we don't set this to NULL while a | |
162 | * FW_NODE_UPDATED callback is being handled. | |
163 | */ | |
c9755e14 | 164 | spin_lock_irqsave(&card->lock, flags); |
19a15b93 | 165 | device->node->data = NULL; |
c9755e14 | 166 | spin_unlock_irqrestore(&card->lock, flags); |
19a15b93 KH |
167 | |
168 | fw_node_put(device->node); | |
19a15b93 KH |
169 | kfree(device->config_rom); |
170 | kfree(device); | |
459f7923 | 171 | fw_card_put(card); |
19a15b93 KH |
172 | } |
173 | ||
174 | int fw_device_enable_phys_dma(struct fw_device *device) | |
175 | { | |
b5d2a5e0 SR |
176 | int generation = device->generation; |
177 | ||
178 | /* device->node_id, accessed below, must not be older than generation */ | |
179 | smp_rmb(); | |
180 | ||
19a15b93 KH |
181 | return device->card->driver->enable_phys_dma(device->card, |
182 | device->node_id, | |
b5d2a5e0 | 183 | generation); |
19a15b93 | 184 | } |
19a15b93 KH |
185 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
186 | ||
7feb9cce KH |
187 | struct config_rom_attribute { |
188 | struct device_attribute attr; | |
189 | u32 key; | |
190 | }; | |
191 | ||
192 | static ssize_t | |
193 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
194 | { | |
195 | struct config_rom_attribute *attr = | |
196 | container_of(dattr, struct config_rom_attribute, attr); | |
197 | struct fw_csr_iterator ci; | |
198 | u32 *dir; | |
c9755e14 SR |
199 | int key, value, ret = -ENOENT; |
200 | ||
201 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
202 | |
203 | if (is_fw_unit(dev)) | |
204 | dir = fw_unit(dev)->directory; | |
205 | else | |
206 | dir = fw_device(dev)->config_rom + 5; | |
207 | ||
208 | fw_csr_iterator_init(&ci, dir); | |
209 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
210 | if (attr->key == key) { |
211 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
212 | "0x%06x\n", value); | |
213 | break; | |
214 | } | |
215 | ||
216 | up_read(&fw_device_rwsem); | |
7feb9cce | 217 | |
c9755e14 | 218 | return ret; |
7feb9cce KH |
219 | } |
220 | ||
221 | #define IMMEDIATE_ATTR(name, key) \ | |
222 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
223 | ||
224 | static ssize_t | |
225 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
226 | { | |
227 | struct config_rom_attribute *attr = | |
228 | container_of(dattr, struct config_rom_attribute, attr); | |
229 | struct fw_csr_iterator ci; | |
230 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 231 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
232 | char *b; |
233 | ||
c9755e14 SR |
234 | down_read(&fw_device_rwsem); |
235 | ||
7feb9cce KH |
236 | if (is_fw_unit(dev)) |
237 | dir = fw_unit(dev)->directory; | |
238 | else | |
239 | dir = fw_device(dev)->config_rom + 5; | |
240 | ||
241 | fw_csr_iterator_init(&ci, dir); | |
242 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
243 | if (attr->key == last_key && | |
244 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
245 | block = ci.p - 1 + value; | |
246 | last_key = key; | |
247 | } | |
248 | ||
249 | if (block == NULL) | |
c9755e14 | 250 | goto out; |
7feb9cce KH |
251 | |
252 | length = min(block[0] >> 16, 256U); | |
253 | if (length < 3) | |
c9755e14 | 254 | goto out; |
7feb9cce KH |
255 | |
256 | if (block[1] != 0 || block[2] != 0) | |
257 | /* Unknown encoding. */ | |
c9755e14 | 258 | goto out; |
7feb9cce | 259 | |
c9755e14 SR |
260 | if (buf == NULL) { |
261 | ret = length * 4; | |
262 | goto out; | |
263 | } | |
7feb9cce KH |
264 | |
265 | b = buf; | |
266 | end = &block[length + 1]; | |
267 | for (p = &block[3]; p < end; p++, b += 4) | |
268 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
269 | ||
270 | /* Strip trailing whitespace and add newline. */ | |
271 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
272 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
273 | ret = b + 2 - buf; |
274 | out: | |
275 | up_read(&fw_device_rwsem); | |
7feb9cce | 276 | |
c9755e14 | 277 | return ret; |
7feb9cce KH |
278 | } |
279 | ||
280 | #define TEXT_LEAF_ATTR(name, key) \ | |
281 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
282 | ||
283 | static struct config_rom_attribute config_rom_attributes[] = { | |
284 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
285 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
286 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
287 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
288 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
289 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
290 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
291 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
292 | }; | |
293 | ||
294 | static void | |
6f2e53d5 KH |
295 | init_fw_attribute_group(struct device *dev, |
296 | struct device_attribute *attrs, | |
297 | struct fw_attribute_group *group) | |
7feb9cce KH |
298 | { |
299 | struct device_attribute *attr; | |
6f2e53d5 KH |
300 | int i, j; |
301 | ||
302 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
303 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
304 | |
305 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
306 | attr = &config_rom_attributes[i].attr; | |
307 | if (attr->show(dev, attr, NULL) < 0) | |
308 | continue; | |
6f2e53d5 | 309 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
310 | } |
311 | ||
6f2e53d5 KH |
312 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
313 | group->attrs[j++] = NULL; | |
314 | group->groups[0] = &group->group; | |
315 | group->groups[1] = NULL; | |
316 | group->group.attrs = group->attrs; | |
317 | dev->groups = group->groups; | |
7feb9cce KH |
318 | } |
319 | ||
19a15b93 | 320 | static ssize_t |
21351dbe KH |
321 | modalias_show(struct device *dev, |
322 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
323 | { |
324 | struct fw_unit *unit = fw_unit(dev); | |
325 | int length; | |
326 | ||
327 | length = get_modalias(unit, buf, PAGE_SIZE); | |
328 | strcpy(buf + length, "\n"); | |
329 | ||
330 | return length + 1; | |
331 | } | |
332 | ||
19a15b93 | 333 | static ssize_t |
21351dbe KH |
334 | rom_index_show(struct device *dev, |
335 | struct device_attribute *attr, char *buf) | |
19a15b93 | 336 | { |
21351dbe KH |
337 | struct fw_device *device = fw_device(dev->parent); |
338 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 339 | |
21351dbe KH |
340 | return snprintf(buf, PAGE_SIZE, "%d\n", |
341 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
342 | } |
343 | ||
21351dbe KH |
344 | static struct device_attribute fw_unit_attributes[] = { |
345 | __ATTR_RO(modalias), | |
346 | __ATTR_RO(rom_index), | |
347 | __ATTR_NULL, | |
19a15b93 KH |
348 | }; |
349 | ||
048961ef | 350 | static ssize_t |
bbd14945 | 351 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 352 | { |
21351dbe | 353 | struct fw_device *device = fw_device(dev); |
c9755e14 | 354 | size_t length; |
048961ef | 355 | |
c9755e14 SR |
356 | down_read(&fw_device_rwsem); |
357 | length = device->config_rom_length * 4; | |
358 | memcpy(buf, device->config_rom, length); | |
359 | up_read(&fw_device_rwsem); | |
21351dbe | 360 | |
c9755e14 | 361 | return length; |
048961ef KH |
362 | } |
363 | ||
bbd14945 KH |
364 | static ssize_t |
365 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
366 | { | |
367 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
368 | int ret; |
369 | ||
370 | down_read(&fw_device_rwsem); | |
371 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
372 | device->config_rom[3], device->config_rom[4]); | |
373 | up_read(&fw_device_rwsem); | |
bbd14945 | 374 | |
c9755e14 | 375 | return ret; |
bbd14945 KH |
376 | } |
377 | ||
21351dbe KH |
378 | static struct device_attribute fw_device_attributes[] = { |
379 | __ATTR_RO(config_rom), | |
bbd14945 | 380 | __ATTR_RO(guid), |
21351dbe | 381 | __ATTR_NULL, |
048961ef KH |
382 | }; |
383 | ||
19a15b93 KH |
384 | struct read_quadlet_callback_data { |
385 | struct completion done; | |
386 | int rcode; | |
387 | u32 data; | |
388 | }; | |
389 | ||
390 | static void | |
391 | complete_transaction(struct fw_card *card, int rcode, | |
392 | void *payload, size_t length, void *data) | |
393 | { | |
394 | struct read_quadlet_callback_data *callback_data = data; | |
395 | ||
396 | if (rcode == RCODE_COMPLETE) | |
397 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
398 | callback_data->rcode = rcode; | |
399 | complete(&callback_data->done); | |
400 | } | |
401 | ||
f8d2dc39 SR |
402 | static int |
403 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 KH |
404 | { |
405 | struct read_quadlet_callback_data callback_data; | |
406 | struct fw_transaction t; | |
407 | u64 offset; | |
b5d2a5e0 SR |
408 | |
409 | /* device->node_id, accessed below, must not be older than generation */ | |
410 | smp_rmb(); | |
19a15b93 KH |
411 | |
412 | init_completion(&callback_data.done); | |
413 | ||
cca60977 | 414 | offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; |
19a15b93 | 415 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 416 | device->node_id, generation, device->max_speed, |
19a15b93 KH |
417 | offset, NULL, 4, complete_transaction, &callback_data); |
418 | ||
419 | wait_for_completion(&callback_data.done); | |
420 | ||
421 | *data = callback_data.data; | |
422 | ||
423 | return callback_data.rcode; | |
424 | } | |
425 | ||
1dadff71 SR |
426 | #define READ_BIB_ROM_SIZE 256 |
427 | #define READ_BIB_STACK_SIZE 16 | |
428 | ||
f8d2dc39 SR |
429 | /* |
430 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
431 | * the config ROM. We do all this with a cached bus generation. If the bus | |
432 | * generation changes under us, read_bus_info_block will fail and get retried. | |
433 | * It's better to start all over in this case because the node from which we | |
434 | * are reading the ROM may have changed the ROM during the reset. | |
435 | */ | |
436 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 437 | { |
c9755e14 | 438 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
439 | u32 sp, key; |
440 | int i, end, length, ret = -1; | |
441 | ||
442 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
443 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
444 | if (rom == NULL) | |
445 | return -ENOMEM; | |
446 | ||
447 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 448 | |
f1397490 SR |
449 | device->max_speed = SCODE_100; |
450 | ||
19a15b93 KH |
451 | /* First read the bus info block. */ |
452 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 453 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 454 | goto out; |
c781c06d KH |
455 | /* |
456 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
457 | * reply with a 0 for the first quadlet of the config |
458 | * rom to indicate that they are booting (for example, | |
459 | * if the firmware is on the disk of a external | |
460 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
461 | * retry mechanism will try again later. |
462 | */ | |
19a15b93 | 463 | if (i == 0 && rom[i] == 0) |
1dadff71 | 464 | goto out; |
19a15b93 KH |
465 | } |
466 | ||
f1397490 SR |
467 | device->max_speed = device->node->max_speed; |
468 | ||
469 | /* | |
470 | * Determine the speed of | |
471 | * - devices with link speed less than PHY speed, | |
472 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
473 | * - all devices if there are 1394b repeaters. | |
474 | * Note, we cannot use the bus info block's link_spd as starting point | |
475 | * because some buggy firmwares set it lower than necessary and because | |
476 | * 1394-1995 nodes do not have the field. | |
477 | */ | |
478 | if ((rom[2] & 0x7) < device->max_speed || | |
479 | device->max_speed == SCODE_BETA || | |
480 | device->card->beta_repeaters_present) { | |
481 | u32 dummy; | |
482 | ||
483 | /* for S1600 and S3200 */ | |
484 | if (device->max_speed == SCODE_BETA) | |
485 | device->max_speed = device->card->link_speed; | |
486 | ||
487 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
488 | if (read_rom(device, generation, 0, &dummy) == |
489 | RCODE_COMPLETE) | |
f1397490 SR |
490 | break; |
491 | device->max_speed--; | |
492 | } | |
493 | } | |
494 | ||
c781c06d KH |
495 | /* |
496 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
497 | * directory structure so we parse it using a stack of |
498 | * references to the blocks that make up the structure. We | |
499 | * push a reference to the root directory on the stack to | |
c781c06d KH |
500 | * start things off. |
501 | */ | |
19a15b93 KH |
502 | length = i; |
503 | sp = 0; | |
504 | stack[sp++] = 0xc0000005; | |
505 | while (sp > 0) { | |
c781c06d KH |
506 | /* |
507 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
508 | * lower 24 bits is the offset into the config rom, |
509 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
510 | * block. |
511 | */ | |
19a15b93 KH |
512 | key = stack[--sp]; |
513 | i = key & 0xffffff; | |
1dadff71 | 514 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
515 | /* |
516 | * The reference points outside the standard | |
517 | * config rom area, something's fishy. | |
518 | */ | |
1dadff71 | 519 | goto out; |
19a15b93 KH |
520 | |
521 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 522 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 523 | goto out; |
19a15b93 KH |
524 | end = i + (rom[i] >> 16) + 1; |
525 | i++; | |
1dadff71 | 526 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
527 | /* |
528 | * This block extends outside standard config | |
19a15b93 KH |
529 | * area (and the array we're reading it |
530 | * into). That's broken, so ignore this | |
c781c06d KH |
531 | * device. |
532 | */ | |
1dadff71 | 533 | goto out; |
19a15b93 | 534 | |
c781c06d KH |
535 | /* |
536 | * Now read in the block. If this is a directory | |
19a15b93 | 537 | * block, check the entries as we read them to see if |
c781c06d KH |
538 | * it references another block, and push it in that case. |
539 | */ | |
19a15b93 | 540 | while (i < end) { |
f8d2dc39 SR |
541 | if (read_rom(device, generation, i, &rom[i]) != |
542 | RCODE_COMPLETE) | |
1dadff71 | 543 | goto out; |
19a15b93 | 544 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 545 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
546 | stack[sp++] = i + rom[i]; |
547 | i++; | |
548 | } | |
549 | if (length < i) | |
550 | length = i; | |
551 | } | |
552 | ||
c9755e14 SR |
553 | old_rom = device->config_rom; |
554 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
555 | if (new_rom == NULL) | |
1dadff71 | 556 | goto out; |
c9755e14 SR |
557 | |
558 | down_write(&fw_device_rwsem); | |
559 | device->config_rom = new_rom; | |
19a15b93 | 560 | device->config_rom_length = length; |
c9755e14 SR |
561 | up_write(&fw_device_rwsem); |
562 | ||
563 | kfree(old_rom); | |
1dadff71 | 564 | ret = 0; |
c9755e14 | 565 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
566 | out: |
567 | kfree(rom); | |
19a15b93 | 568 | |
1dadff71 | 569 | return ret; |
19a15b93 KH |
570 | } |
571 | ||
572 | static void fw_unit_release(struct device *dev) | |
573 | { | |
574 | struct fw_unit *unit = fw_unit(dev); | |
575 | ||
576 | kfree(unit); | |
577 | } | |
578 | ||
21351dbe | 579 | static struct device_type fw_unit_type = { |
21351dbe KH |
580 | .uevent = fw_unit_uevent, |
581 | .release = fw_unit_release, | |
582 | }; | |
583 | ||
19a15b93 KH |
584 | static int is_fw_unit(struct device *dev) |
585 | { | |
21351dbe | 586 | return dev->type == &fw_unit_type; |
19a15b93 KH |
587 | } |
588 | ||
589 | static void create_units(struct fw_device *device) | |
590 | { | |
591 | struct fw_csr_iterator ci; | |
592 | struct fw_unit *unit; | |
593 | int key, value, i; | |
594 | ||
595 | i = 0; | |
596 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
597 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
598 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
599 | continue; | |
600 | ||
c781c06d KH |
601 | /* |
602 | * Get the address of the unit directory and try to | |
603 | * match the drivers id_tables against it. | |
604 | */ | |
2d826cc5 | 605 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
606 | if (unit == NULL) { |
607 | fw_error("failed to allocate memory for unit\n"); | |
608 | continue; | |
609 | } | |
610 | ||
611 | unit->directory = ci.p + value - 1; | |
612 | unit->device.bus = &fw_bus_type; | |
21351dbe | 613 | unit->device.type = &fw_unit_type; |
19a15b93 | 614 | unit->device.parent = &device->device; |
2d826cc5 | 615 | snprintf(unit->device.bus_id, sizeof(unit->device.bus_id), |
19a15b93 KH |
616 | "%s.%d", device->device.bus_id, i++); |
617 | ||
6f2e53d5 KH |
618 | init_fw_attribute_group(&unit->device, |
619 | fw_unit_attributes, | |
620 | &unit->attribute_group); | |
7feb9cce KH |
621 | if (device_register(&unit->device) < 0) |
622 | goto skip_unit; | |
623 | ||
7feb9cce KH |
624 | continue; |
625 | ||
7feb9cce KH |
626 | skip_unit: |
627 | kfree(unit); | |
19a15b93 KH |
628 | } |
629 | } | |
630 | ||
631 | static int shutdown_unit(struct device *device, void *data) | |
632 | { | |
21351dbe | 633 | device_unregister(device); |
19a15b93 KH |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
c9755e14 SR |
638 | /* |
639 | * fw_device_rwsem acts as dual purpose mutex: | |
640 | * - serializes accesses to fw_device_idr, | |
641 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
642 | * fw_unit.directory, unless those accesses happen at safe occasions | |
643 | */ | |
644 | DECLARE_RWSEM(fw_device_rwsem); | |
645 | ||
a3aca3da KH |
646 | static DEFINE_IDR(fw_device_idr); |
647 | int fw_cdev_major; | |
648 | ||
96b19062 | 649 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
650 | { |
651 | struct fw_device *device; | |
652 | ||
c9755e14 | 653 | down_read(&fw_device_rwsem); |
a3aca3da | 654 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
655 | if (device) |
656 | fw_device_get(device); | |
c9755e14 | 657 | up_read(&fw_device_rwsem); |
a3aca3da KH |
658 | |
659 | return device; | |
660 | } | |
661 | ||
19a15b93 KH |
662 | static void fw_device_shutdown(struct work_struct *work) |
663 | { | |
664 | struct fw_device *device = | |
665 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
666 | int minor = MINOR(device->device.devt); |
667 | ||
2603bf21 | 668 | fw_device_cdev_remove(device); |
19a15b93 KH |
669 | device_for_each_child(&device->device, NULL, shutdown_unit); |
670 | device_unregister(&device->device); | |
96b19062 | 671 | |
c9755e14 | 672 | down_write(&fw_device_rwsem); |
96b19062 | 673 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 674 | up_write(&fw_device_rwsem); |
96b19062 | 675 | fw_device_put(device); |
19a15b93 KH |
676 | } |
677 | ||
21351dbe | 678 | static struct device_type fw_device_type = { |
21351dbe KH |
679 | .release = fw_device_release, |
680 | }; | |
681 | ||
c781c06d KH |
682 | /* |
683 | * These defines control the retry behavior for reading the config | |
19a15b93 KH |
684 | * rom. It shouldn't be necessary to tweak these; if the device |
685 | * doesn't respond to a config rom read within 10 seconds, it's not | |
686 | * going to respond at all. As for the initial delay, a lot of | |
687 | * devices will be able to respond within half a second after bus | |
688 | * reset. On the other hand, it's not really worth being more | |
689 | * aggressive than that, since it scales pretty well; if 10 devices | |
c781c06d KH |
690 | * are plugged in, they're all getting read within one second. |
691 | */ | |
19a15b93 | 692 | |
c5dfd0a5 KH |
693 | #define MAX_RETRIES 10 |
694 | #define RETRY_DELAY (3 * HZ) | |
19a15b93 KH |
695 | #define INITIAL_DELAY (HZ / 2) |
696 | ||
697 | static void fw_device_init(struct work_struct *work) | |
698 | { | |
19a15b93 KH |
699 | struct fw_device *device = |
700 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 701 | int minor, err; |
19a15b93 | 702 | |
c781c06d KH |
703 | /* |
704 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 705 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
706 | * device. |
707 | */ | |
19a15b93 | 708 | |
f8d2dc39 | 709 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
710 | if (device->config_rom_retries < MAX_RETRIES && |
711 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
712 | device->config_rom_retries++; |
713 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
714 | } else { | |
907293d7 | 715 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 716 | device->node_id); |
931c4834 KH |
717 | if (device->node == device->card->root_node) |
718 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
719 | fw_device_release(&device->device); |
720 | } | |
721 | return; | |
722 | } | |
723 | ||
a3aca3da | 724 | err = -ENOMEM; |
96b19062 SR |
725 | |
726 | fw_device_get(device); | |
c9755e14 | 727 | down_write(&fw_device_rwsem); |
a3aca3da KH |
728 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
729 | err = idr_get_new(&fw_device_idr, device, &minor); | |
c9755e14 | 730 | up_write(&fw_device_rwsem); |
96b19062 | 731 | |
a3aca3da KH |
732 | if (err < 0) |
733 | goto error; | |
734 | ||
19a15b93 | 735 | device->device.bus = &fw_bus_type; |
21351dbe | 736 | device->device.type = &fw_device_type; |
19a15b93 | 737 | device->device.parent = device->card->device; |
a3aca3da | 738 | device->device.devt = MKDEV(fw_cdev_major, minor); |
2d826cc5 | 739 | snprintf(device->device.bus_id, sizeof(device->device.bus_id), |
a3aca3da | 740 | "fw%d", minor); |
19a15b93 | 741 | |
6f2e53d5 KH |
742 | init_fw_attribute_group(&device->device, |
743 | fw_device_attributes, | |
744 | &device->attribute_group); | |
19a15b93 KH |
745 | if (device_add(&device->device)) { |
746 | fw_error("Failed to add device.\n"); | |
a3aca3da | 747 | goto error_with_cdev; |
19a15b93 KH |
748 | } |
749 | ||
19a15b93 KH |
750 | create_units(device); |
751 | ||
c781c06d KH |
752 | /* |
753 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
754 | * out from under us while we did the intialization work, we |
755 | * have to shut down the device again here. Normally, though, | |
756 | * fw_node_event will be responsible for shutting it down when | |
757 | * necessary. We have to use the atomic cmpxchg here to avoid | |
758 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
759 | * fw_node_event(). |
760 | */ | |
641f8791 | 761 | if (atomic_cmpxchg(&device->state, |
19a15b93 | 762 | FW_DEVICE_INITIALIZING, |
fa6e697b | 763 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) { |
c9755e14 | 764 | fw_device_shutdown(work); |
fa6e697b SR |
765 | } else { |
766 | if (device->config_rom_retries) | |
767 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
768 | "%d config ROM retries\n", | |
769 | device->device.bus_id, | |
770 | device->config_rom[3], device->config_rom[4], | |
771 | 1 << device->max_speed, | |
772 | device->config_rom_retries); | |
773 | else | |
774 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
775 | device->device.bus_id, | |
776 | device->config_rom[3], device->config_rom[4], | |
777 | 1 << device->max_speed); | |
c9755e14 | 778 | device->config_rom_retries = 0; |
fa6e697b | 779 | } |
19a15b93 | 780 | |
c781c06d KH |
781 | /* |
782 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
783 | * root node config rom. If this races with a bus reset we |
784 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
785 | * pretty harmless. |
786 | */ | |
19a15b93 KH |
787 | if (device->node == device->card->root_node) |
788 | schedule_delayed_work(&device->card->work, 0); | |
789 | ||
790 | return; | |
791 | ||
a3aca3da | 792 | error_with_cdev: |
c9755e14 | 793 | down_write(&fw_device_rwsem); |
a3aca3da | 794 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 795 | up_write(&fw_device_rwsem); |
373b2edd | 796 | error: |
96b19062 SR |
797 | fw_device_put(device); /* fw_device_idr's reference */ |
798 | ||
799 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
800 | } |
801 | ||
802 | static int update_unit(struct device *dev, void *data) | |
803 | { | |
804 | struct fw_unit *unit = fw_unit(dev); | |
805 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
806 | ||
015b066f KH |
807 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
808 | down(&dev->sem); | |
19a15b93 | 809 | driver->update(unit); |
015b066f KH |
810 | up(&dev->sem); |
811 | } | |
19a15b93 KH |
812 | |
813 | return 0; | |
814 | } | |
815 | ||
5f480477 KH |
816 | static void fw_device_update(struct work_struct *work) |
817 | { | |
818 | struct fw_device *device = | |
819 | container_of(work, struct fw_device, work.work); | |
820 | ||
97bd9efa | 821 | fw_device_cdev_update(device); |
5f480477 KH |
822 | device_for_each_child(&device->device, NULL, update_unit); |
823 | } | |
824 | ||
c9755e14 SR |
825 | enum { |
826 | REREAD_BIB_ERROR, | |
827 | REREAD_BIB_GONE, | |
828 | REREAD_BIB_UNCHANGED, | |
829 | REREAD_BIB_CHANGED, | |
830 | }; | |
831 | ||
832 | /* Reread and compare bus info block and header of root directory */ | |
833 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
834 | { | |
835 | u32 q; | |
836 | int i; | |
837 | ||
838 | for (i = 0; i < 6; i++) { | |
839 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
840 | return REREAD_BIB_ERROR; | |
841 | ||
842 | if (i == 0 && q == 0) | |
843 | return REREAD_BIB_GONE; | |
844 | ||
845 | if (i > device->config_rom_length || q != device->config_rom[i]) | |
846 | return REREAD_BIB_CHANGED; | |
847 | } | |
848 | ||
849 | return REREAD_BIB_UNCHANGED; | |
850 | } | |
851 | ||
852 | static void fw_device_refresh(struct work_struct *work) | |
853 | { | |
854 | struct fw_device *device = | |
855 | container_of(work, struct fw_device, work.work); | |
856 | struct fw_card *card = device->card; | |
857 | int node_id = device->node_id; | |
858 | ||
859 | switch (reread_bus_info_block(device, device->generation)) { | |
860 | case REREAD_BIB_ERROR: | |
861 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
862 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
863 | device->config_rom_retries++; | |
864 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
865 | ||
866 | return; | |
867 | } | |
868 | goto give_up; | |
869 | ||
870 | case REREAD_BIB_GONE: | |
871 | goto gone; | |
872 | ||
873 | case REREAD_BIB_UNCHANGED: | |
874 | if (atomic_cmpxchg(&device->state, | |
875 | FW_DEVICE_INITIALIZING, | |
876 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
877 | goto gone; | |
878 | ||
879 | fw_device_update(work); | |
880 | device->config_rom_retries = 0; | |
881 | goto out; | |
882 | ||
883 | case REREAD_BIB_CHANGED: | |
884 | break; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Something changed. We keep things simple and don't investigate | |
889 | * further. We just destroy all previous units and create new ones. | |
890 | */ | |
891 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
892 | ||
893 | if (read_bus_info_block(device, device->generation) < 0) { | |
894 | if (device->config_rom_retries < MAX_RETRIES && | |
895 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
896 | device->config_rom_retries++; | |
897 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
898 | ||
899 | return; | |
900 | } | |
901 | goto give_up; | |
902 | } | |
903 | ||
904 | create_units(device); | |
905 | ||
906 | if (atomic_cmpxchg(&device->state, | |
907 | FW_DEVICE_INITIALIZING, | |
908 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
909 | goto gone; | |
910 | ||
911 | fw_notify("refreshed device %s\n", device->device.bus_id); | |
912 | device->config_rom_retries = 0; | |
913 | goto out; | |
914 | ||
915 | give_up: | |
916 | fw_notify("giving up on refresh of device %s\n", device->device.bus_id); | |
917 | gone: | |
918 | atomic_set(&device->state, FW_DEVICE_SHUTDOWN); | |
919 | fw_device_shutdown(work); | |
920 | out: | |
921 | if (node_id == card->root_node->node_id) | |
922 | schedule_delayed_work(&card->work, 0); | |
923 | } | |
924 | ||
19a15b93 KH |
925 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
926 | { | |
927 | struct fw_device *device; | |
928 | ||
19a15b93 KH |
929 | switch (event) { |
930 | case FW_NODE_CREATED: | |
931 | case FW_NODE_LINK_ON: | |
932 | if (!node->link_on) | |
933 | break; | |
c9755e14 | 934 | create: |
19a15b93 KH |
935 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
936 | if (device == NULL) | |
937 | break; | |
938 | ||
c781c06d KH |
939 | /* |
940 | * Do minimal intialization of the device here, the | |
19a15b93 KH |
941 | * rest will happen in fw_device_init(). We need the |
942 | * card and node so we can read the config rom and we | |
943 | * need to do device_initialize() now so | |
944 | * device_for_each_child() in FW_NODE_UPDATED is | |
c781c06d KH |
945 | * doesn't freak out. |
946 | */ | |
19a15b93 | 947 | device_initialize(&device->device); |
641f8791 | 948 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 949 | device->card = fw_card_get(card); |
19a15b93 KH |
950 | device->node = fw_node_get(node); |
951 | device->node_id = node->node_id; | |
952 | device->generation = card->generation; | |
97bd9efa | 953 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 954 | |
c781c06d KH |
955 | /* |
956 | * Set the node data to point back to this device so | |
19a15b93 | 957 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
958 | * and generation for the device. |
959 | */ | |
19a15b93 KH |
960 | node->data = device; |
961 | ||
c781c06d KH |
962 | /* |
963 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
964 | * especially if they are bus powered and go through |
965 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
966 | * first config rom scan half a second after bus reset. |
967 | */ | |
19a15b93 KH |
968 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
969 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
970 | break; | |
971 | ||
c9755e14 SR |
972 | case FW_NODE_INITIATED_RESET: |
973 | device = node->data; | |
974 | if (device == NULL) | |
975 | goto create; | |
976 | ||
977 | device->node_id = node->node_id; | |
978 | smp_wmb(); /* update node_id before generation */ | |
979 | device->generation = card->generation; | |
980 | if (atomic_cmpxchg(&device->state, | |
981 | FW_DEVICE_RUNNING, | |
982 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
983 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
984 | schedule_delayed_work(&device->work, | |
985 | node == card->local_node ? 0 : INITIAL_DELAY); | |
986 | } | |
987 | break; | |
988 | ||
19a15b93 KH |
989 | case FW_NODE_UPDATED: |
990 | if (!node->link_on || node->data == NULL) | |
991 | break; | |
992 | ||
993 | device = node->data; | |
994 | device->node_id = node->node_id; | |
b5d2a5e0 | 995 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 996 | device->generation = card->generation; |
5f480477 KH |
997 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
998 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
999 | schedule_delayed_work(&device->work, 0); | |
1000 | } | |
19a15b93 KH |
1001 | break; |
1002 | ||
1003 | case FW_NODE_DESTROYED: | |
1004 | case FW_NODE_LINK_OFF: | |
1005 | if (!node->data) | |
1006 | break; | |
1007 | ||
c781c06d KH |
1008 | /* |
1009 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1010 | * are two cases here: either the device is fully |
1011 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1012 | * process of reading its config rom | |
1013 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1014 | * initialized we can reuse device->work to schedule a | |
1015 | * full fw_device_shutdown(). If not, there's work | |
1016 | * scheduled to read it's config rom, and we just put | |
1017 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1018 | * to create the device. |
1019 | */ | |
19a15b93 | 1020 | device = node->data; |
641f8791 | 1021 | if (atomic_xchg(&device->state, |
5f480477 KH |
1022 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
1023 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
1024 | schedule_delayed_work(&device->work, 0); |
1025 | } | |
1026 | break; | |
1027 | } | |
1028 | } |